Is there anything he could say that wouldn't invite the ad hominem? I'm trying to imagine him saying "Yup, money is pretty damn important" and I suspect the response would be exactly the same. It seems like the only thing you can do if you're wealthy is keep silent.

FWIW, I'm hardly very rich and I've believed that since I got out of college. Mostly because those who believe success in business is just a game and don't get emotionally attached to the rewards tend to do a lot better in business than those who must get rich quick.